Tested the patch on OpenBSD 8.0-current with the Intel Arc A550M, and it worked.
dmesg output confirms both devices attach successfully: inteldrm0 at pci3 dev 0 function 0 "Intel Arc A550M" rev 0x08 drm1 at inteldrm0 inteldrm0: msi, DG2, gen 12 inteldrm1 at pci0 dev 2 function 0 "Intel Graphics" rev 0x0c drm0 at inteldrm1 inteldrm1: msi, ALDERLAKE_P, gen 12 inteldrm1: 1920x1080, 32bpp Thank you for the quick fix Jonathan! > On Tue, Oct 20, 2026 at 01:01:55AM -0700, sushi wrote: >> >Synopsis: >> inteldrm page fault panic on boot with Intel Arc A550M >> >> >Category: kernel >> >Environment: >> System : OpenBSD 8.0 >> Details : OpenBSD 8.0 (GENERIC.MP) #84: Tue Oct 6 23:13:49 MDT >> 2026 >> >> [email protected]:/usr/src/sys/arch/amd64/compile/GENERIC.MP >> >> Architecture: OpenBSD.amd64 >> Machine : amd64 >> >Description: >> During an upgrade from OpenBSD 7.9 to 8.0, the system panics >> consistently >> during boot while initializing the inteldrm / i915 driver stack. The >> crash >> occurs specifically during backlight configuration. >> >How-To-Repeat: >> Attempt to boot OpenBSD 8.0 normally with 'inteldrm' enabled on a system >> utilizing an Intel Arc A550M graphics card. >> >Fix: >> workaround: >> boot> -c >> UKC> disable inteldrm >> UKC> quit >> >> [Crash Traceback Summary] >> kernel: page fault trap, code=0 >> stopped at drm_connector_list_iter_next+0x70 >> drm_connector_list_iter_next(...) >> inteldrm_native_backlight(...) at inteldrm_native_backlight >> inteldrm_init_backlight(...) at inteldrm_init_backlight >> i915_driver_probe(...) at i915_driver_probe >> inteldrm_attachhook(...) at inteldrm_attachhook >> config_process_deferred_mountroot() >> main() at main > > The connector state is not initialised when the device has no > display controller. > > Try this: > > Index: sys/dev/pci/drm/i915/i915_driver.c > =================================================================== > RCS file: /cvs/src/sys/dev/pci/drm/i915/i915_driver.c,v > diff -u -p -r1.37 i915_driver.c > --- sys/dev/pci/drm/i915/i915_driver.c 5 Oct 2026 08:20:26 -0000 > 1.37 > +++ sys/dev/pci/drm/i915/i915_driver.c 21 Oct 2026 05:42:29 -0000 > @@ -2582,9 +2582,14 @@ void > inteldrm_native_backlight(struct drm_i915_private *dev_priv) > { > struct drm_device *dev = &dev_priv->drm; > + struct intel_display *display = dev_priv->display; > struct drm_connector_list_iter conn_iter; > struct drm_connector *connector; > > + /* connector state not initialised with no crtc */ > + if (!intel_display_device_present(display)) > + return; > + > drm_connector_list_iter_begin(dev, &conn_iter); > drm_for_each_connector_iter(connector, &conn_iter) { > struct intel_connector *intel_connector; > @@ -2628,10 +2633,15 @@ inteldrm_firmware_backlight(struct drm_i > struct wsdisplay_param *dp) > { > struct drm_device *dev = &dev_priv->drm; > + struct intel_display *display = dev_priv->display; > struct drm_connector_list_iter conn_iter; > struct drm_connector *connector; > struct backlight_properties props; > struct backlight_device *bd; > + > + /* connector state not initialised with no crtc */ > + if (!intel_display_device_present(display)) > + return; > > memset(&props, 0, sizeof(props)); > props.type = BACKLIGHT_FIRMWARE; >
